Wait on notification, occurence. is it sleep?

Hai
Am using PXI with RTOS, it has 2 processes . i need to wake up a task on an event, execute it and then sleep again. I wanted to know if i can use Occurence or Notifers to achive this. Since these uses wait on notification and wait on occurence functions i wanted to know if the thread is in sleep mode when in this function, since this is a high priority task if it is waiting on notifier am afraid it will dominate CPU and does not give time for normal priority tasks to execute.
Thnx for any reply

The thread running your high priority VI in which you wait for notifier (or occurrence) will be "blocked" until you send notification (or set occurrence). While the thread is blocked, other threads will run, including lower priority threads. One way to verify this is with the execution trace tool.
If you don't have the trace tool, there's another way to test this. In a normal priority VI, obtain a notifier and call a while loop*. In parallel, call a time-critical subVI that waits for notification (see attachment). After the loop finishes, send notification. This VI will finish, which means the time-critical subVI had to relinquish the CPU in order for the normal priority parent to send notification. Otherwise, we'd be waiting forever for a notifi
cation in the time-critical subVI.
*Put sleep in the while loop to ensure that LabVIEW reaches the time-critical subVI before the while loop runs to completion.
Attachments:
notifier.bmp ‏2137 KB

Similar Messages

Can anyone explain "ignore previous" feature of Wait on Notification function?

Can anyone explain "ignore previous" feature of Wait on Notification function? I have read the help description and other material and I just don't get it. Reference to any good articles I can read will be appreciated.
Thanks in advance.

Hi VI Joe,
if the "ignore previous" input is true, then you only get the notifiers which arrive if you are waiting in the "Wait on Notifiacation" function. If there is a notifier before this function is executed, then you don't see it.
Edit: See the attached example. If the constant is true, then the vi will wait on a notification because the previous is ignored, if the constant is false, then it receives the notifier.
Hope it helps.
Mike
Message Edited by MikeS81 on 06-26-2009 02:36 PM
Attachments:
Notifier_LV85.vi ‏9 KB

Waiting for notification on: weblogic/t3/srvr/T3Srvr@0xac909c80[fat lock]

i am trying to deploy a soa composite and i end up getting the following error.....
looks like the first phase of the deployment is successfull and the setStatus has a thread block , please suggest
THREAD DUMP
"Main Thread" id=1 idx=0x4 tid=1099 prio=5 alive, waiting, native_blocked
-- Waiting for notification on: weblogic/t3/srvr/T3Srvr@0xac909c80[fat lock]
at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Method)
at java/lang/Object.wait(J)V(Native Method)
at java/lang/Object.wait(Object.java:485)
at weblogic/t3/srvr/T3Srvr.waitForDeath(T3Srvr.java:979)
^-- Lock released while waiting: weblogic/t3/srvr/T3Srvr@0xac909c80[fat lock]
at weblogic/t3/srvr/T3Srvr.run(T3Srvr.java:488)
at weblogic/Server.main(Server.java:71)
at jrockit/vm/RNI.c2java(JJJJJ)V(Native Method)
-- end of trace
"(Signal Handler)" id=2 idx=0x8 tid=1100 prio=5 alive, native_blocked, daemon
"(OC Main Thread)" id=3 idx=0xc tid=1101 prio=5 alive, native_waiting, daemon
"(VM Periodic Task)" id=6 idx=0x38 tid=1112 prio=10 alive, native_blocked, daemon
Blocked lock chains
===================
Chain 2:
"ExecuteThread: '1' for queue: 'weblogic.socket.Muxer'" id=26 idx=0x74 tid=1179 waiting for java/lang/String@0xac909020 held by:
"ExecuteThread: '2' for queue: 'weblogic.socket.Muxer'" id=27 idx=0x78 tid=1180 in chain 1
Chain 3:
"ExecuteThread: '3' for queue: 'weblogic.socket.Muxer'" id=28 idx=0x7c tid=1181 waiting for java/lang/String@0xac909020 held by:
"ExecuteThread: '2' for queue: 'weblogic.socket.Muxer'" id=27 idx=0x78 tid=1180 in chain 1
Open lock chains
================
Chain 1:
"ExecuteThread: '0' for queue: 'weblogic.socket.Muxer'" id=25 idx=0x70 tid=1178 waiting for java/lang/String@0xac909020 held by:
"ExecuteThread: '2' for queue: 'weblogic.socket.Muxer'" id=27 idx=0x78 tid=1180 (active)
===== END OF THREAD DUMP ===============

You may refer -
SOA composite deployment exception [STUCK] ExecuteThread: '4' for queue:
Regards,
Anuj

Two "Wait for Notification" with single Notifyer?

I feel like I should know this answer, but my code was buggy when I did this.
Can you have multiple "Wait for Notification" VIs attached to the same Notifyer?
The help seems to suggest that Notifiers are only for two independent loops:
Notifiers are a tool for communicating between two independent parts of a block diagram or between two VIs running on the same machine.
Solved!
Go to Solution.

Can you have multiple "Wait for Notification" VIs attached to the same Notifier?
Yes
See the Notifier Demultiplexer example.
"In theory, theory and practice are the same. In practice, they’re not."

Which Wait-on-Notification's (of all types) are currently Waiting?

I may have a wait-on-nofication deadlock. Before I use the Navy method (beat to fit, paint to match) by changing a bunch of WoN's Wait-on-Notification-with-History, it would be great simply to be able to see which WoN's are currently waiting. In this way I could maybe see which WoN's were participating in the deadlock and hence rethink my dataflow pattern. I haven't found a tool highlight WoN's, list WoN's, etc. But it sure would be handy.
Any info or ideas?
Solved!
Go to Solution.

The desktop execution trace toolkit might show you who's waiting (or at least in which VI). I haven't used it so I'm not sure.
Another option for handling this in code is to use a timeout and not do anything if the timed out output is true, but this is most likely going to be a hack instead of a real solution in your case.
Try to take over the world!

Is there an alarm clock app that ignores other notifications while you're sleeping?

my bb had an alarm clock application that was awesome - it "held off" all notifications that i would get during the night until i turned off my alarm clock in the morning. so, all the email notices, late night text messaging, facebook "pops" all were silenced and I could get a solid night's sleep keeping my phone on for the alarm app. does the iphone have such an app?

its already that way...
just put it on silent, the alarm still sounds.
my vibrate is off when in mute so it doesn't vibrate either-
but the alarm works when the phone is on silent. just make sure the ringer volume is up.

Wait on Notification from Multiple behaves the same with or without History

I'm running this VI on a cRIO-9066, and both "Wait" functions behave the same. After reading the LV Help, I would expect the "With Notifier History" one to return an array of two elements, not one. Is this a bug?
(Attachment is LV 2014 SP10
Solved!
Go to Solution.
Attachments:
Untitled 2.vi ‏11 KB

Staab_Engineering wrote:
After reading the LV Help, I would expect the "With Notifier History" one to return an array of two elements, not one.
Why? Unlike the help for W4MN, the one for W4MNWH is not explicit in saying that it continues as soon as one of the notifiers gets a notification, but it also doesn't say it will wait for all of them. Your example clearly shows that it continues as soon as at least one has a notification.
I'm too tired at the moment to work through the W4MNWH use cases, so I have no particular expectation for how it should behave.
Try to take over the world!

Correlation termiatation ,external message wait and Notification.send

Hi,
In one of my process I have correlation (is being created using requestId)and external message wait to terminate this correlation .By using Correlation.terminate("ProcessName"); I am terminating correlation.Its working fine.
My requirement is ,After correlation terminate ,If I call external message wait(by passing requestId) using following code then It should throw the exception.Currently It is not throwing exception.
Fuego.Lib.Notification.send(processId : "ProcessName", activityName : "MessageWait",
arguments : {argument is requestID : "In");
Please help me how to set up correlation or external message wait to get exception when we call external message wait after termination of request
Thanks
Sailendra

Please help me..still facing this issue
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Sailendra

Call waiting and notification of missed calls

Hi,
Sometimes (in really veri offten as i have a lot voice call diring my working day) i'm getting incoming calls when talking to somebody by my iPhone 4 (iOS5). Unfortunatelly, there're no any notifications that i have missed calls on lock screen when i finished initial call. If it's possible to fix it somehow?

Check this Bug-Id:CSCee66474

My MBP won't sleep HD, and I have tried every solution already posted.

This is a persistent problem that began over 1 year ago, so information about how this unit might have been configured when it began is no longer available, but I have scoured this and google in general, using all search terms I can think of and still I can not pin point a reason my HD will not sleep. I have been advised that there is a "process" keeping my unit awake, but I don't understand how that is possible when it won't even sleep when it is on the startup screen. So here are some particulars.....maybe you have some new thoughts?
I drive a MBP with a 2.4 Core Duo processor running OS 10.9.1, 5gb of mem, 750gb of storage with 500+ free.
1) I made a clean install of system software and a clean upgrade to Mavericks (as a way to try to solve the problem which began when I was using Mtn Lion). There is no third part software loaded onto the machine, yet.
2) I have yet to launch iTunes, or iPhoto, or a Browser, no printer has been added.
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4) It won't sleep even on the start-up screen. It won't sleep if I go through the menu or close the lid. It will power off the monitor, and begin to wind down the HD, but just as it reaches the end of the sequence BING and the screen comes on again. If the lid is closed, it will stay that way until the battery runs out, unless it's plugged in. SMC and VMRAM resets not effective.
5) I have no files on this computer so I don't care about losing them.
6) This computer did not have this problem using Snow Leopard, and even worked for a time using Mtn Lion and changing to Mavericks has not affected the problem which leads me to think it's not OS related. It acts like a firmware issue, but as far as I can find there is no firmware upgrade for my unit.

Hello Bobz,
Thank you for responding. You require that I modify #2, above. I have now gone on internet, opened Safari. I downloaded etrecheck, restarted, waited for computer to cycle through sleep cycle (1 min). After failure, I ran etrecheck. Here are the results:
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          MacBook Pro - model: MacBookPro4,1
          1 2.4 GHz Intel Core 2 Duo CPU: 2 cores
          5 GB RAM
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          GeForce 8600M GT     - VRAM: 256 MB
System Software:
          OS X 10.9.1 (13B42) - Uptime: 0 days 0:29:13
Disk Information:
          ST9750420AS disk0 : (750.16 GB)
                    EFI (disk0s1) <not mounted>: 209.7 MB
                    inni (disk0s2) /: 749.3 GB (353.92 GB free)
                    Recovery HD (disk0s3) <not mounted>: 650 MB
USB Information:
          Apple Inc. Built-in iSight
          Apple Inc. BRCM2046 Hub
                    Apple Inc. Bluetooth USB Host Controller
          Apple Computer, Inc. IR Receiver
          Apple, Inc. Apple Internal Keyboard / Trackpad
FireWire Information:
Thunderbolt Information:
Kernel Extensions:
Problem System Launch Daemons:
Problem System Launch Agents:
Launch Daemons:
Launch Agents:
User Launch Agents:
User Login Items:
          None
Internet Plug-ins:
          Default Browser: Version: 537 - SDK 10.9
          QuickTime Plugin: Version: 7.7.3
Audio Plug-ins:
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          AirPlay: Version: 1.9 - SDK 10.9
          AppleAVBAudio: Version: 2.0.0 - SDK 10.9
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How to disable audio output in while in sleep mode? (annoying issue)

I have a my workstation set up in my bedroom and when I am not using it I put it to sleep (or wait for it to go to sleep deu to inactivity). The problem is that when its asleep the audio output is still active. So when I get emails and such the speakers still emit the notification/alert sounds even though my computer is in sleep mode. This is really annoying since I work with offshore teams and they send me email in the late night and early morning (when I am sleeping). I can't seem to find a setting to change that. Any ideas?
My set up is as follows:
17 macbook pro (early 2011)
OSX 10.9.4
Connected to a 27" thunderbolt display
Thanks!

Thanks KiltedTim. I am starting to agree with you. Do you know what I can log for in the logs that will give me an idea?
Esquared - Thanks for the link. The only thing I see in the logs is when I woke up my computer this morning. But all morning (before I woke my computer) I was hearing a bunch of alerts/notification. Here's a look at the log query I did.

Change Notification with C#

I am trying to get a test application to work using Oracle Change Notification with C#, but I am not receiving the callback notification in my application. Oracle DB version is 11.2.0.1.0. Oracle.DataAccess v.2.112.30. I can confirm the query gets registered in Oracle by viewing SYS.USER_CHANGE_NOTIFICATION_REGS and SYS.USER_CQ_NOTIFICATION_QUERIES. However, nothing ever appears in SYS.DBA_CHANGE_NOTIFICATION_REGS.
The registration persists until I commit a transaction on the table. The registration disappears after a few seconds after the commit and my application does not received the notification.
I have made sure my computer is listening on the correct port and have even tried turning off any firewall that could be blocking the port.
I do have GRANT CHANGE NOTIFICATION to MYSCHEMA, GRANT EXECUTE ON DBMS_CHANGE_NOTIFICATION TO MYSCHEMA, and the JOB_QUEUE_PROCESSES is set to 1.
Questions:
1) Should the registration be visible in SYS.DBA_CHANGE_NOTIFICATION_REGS and, if so, what could be causing it not to be when it is visible in SYS.USER_CHANGE_NOTIFICATION_REGS and SYS.USER_CQ_NOTIFICATION_QUERIES?
2) What could be causing the registration to disappear after a commit?
3) What could be causing the failure of the notification to my application?
Here is the C# code I am using and it is basically the same as from the Oracle website:
using System;
using System.Threading;
using System.Data;
using Oracle.DataAccess.Client;
namespace NotifyTest
public class Program
public static bool IsNotified = false;
public static void Main(string[] args)
string constr = "User Id=mySchema;Password=myPassword;Data Source=myOracleInstance";
OracleDependency dep = null;
try
using (var con = new OracleConnection(constr))
Console.WriteLine("Registering query...");
var cmd = new OracleCommand("select * from mySchema.NOTIFY_TEST", con);
con.Open();
OracleDependency.Port = 1005;
dep = new OracleDependency(cmd);
dep.OnChange += OnMyNotificaton;
int queryRegistered = cmd.ExecuteNonQuery();
// If oracle returns -1, then the query is successfully registered
if (queryRegistered == -1)
Console.WriteLine("Query Registered...");
Console.WriteLine("Listening for Callback...");
else
Console.WriteLine("There was an error...");
catch (Exception e)
Console.WriteLine(e.Message);
// Loop while waiting for notification
while (IsNotified == false)
Thread.Sleep(100);
public static void OnMyNotificaton(object sender, OracleNotificationEventArgs arg)
Console.WriteLine("Table change notification event is raised");
Console.WriteLine(arg.Source.ToString());
Console.WriteLine(arg.Info.ToString());
Console.WriteLine(arg.Source.ToString());
Console.WriteLine(arg.Type.ToString());
IsNotified = true;
}

Just wanted to provide an update as to how I resolved this issue. I changed my Oracle.DataAccess.dll from v.2.112.3.0 to v.2.112.1.2 and it works fine.

Threads waiting the same event

hi all,
i have two thread waiting an event
and another who notify them
//the class event
public final class Event {
* variable used to store the notification if it takes place
* before being expected
private boolean status = false;
public final synchronized void waitForNotification() {
while (status == false ) {
try {
wait();
catch (InterruptedException e) {
status = false ;
// notify all waits on this event
public final synchronized void wakeUp() {
status = true;
notifyAll();
// the class TestThread implements a thread that have an event waiting for a notification
public class TestThread extends Thread{
private Event event;
public TestThread( Event e){
event=e;
public void run(){
for (int i = 1; i < 4; i += 1) {
try {
Thread.sleep(2);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
e.waitForNotification();
// the class TestThread2 implements a thread that have an event waiting for a notification
public class TestThread2 extends Thread{
private Event event;
public TestThread( Event e){
event=e;
public void run(){
for (int i = 1; i < 4; i += 1) {
e.wakeUp();
//the class main
public class test {
* @param args
public static void main(String[] args) {
// TODO Auto-generated method stub
Event e = new event();
TestThread th1 = new TestThreadConsumer(e);
TestThread th2 = new TestThread(e);
TestThread2 th= new TestThread2(e);
th1.start();
th2.start();
th3.start();
1st case
the problem is that the notification could not be seen to the tow threads
because if the tow are waiting the notification
and the other thread send notification
one of the tow see the notificztion and wake up and set the flag status to false so the other one could not ever wake up
2d case
the notification of the second thread could be done in the second itiration or in the other ones
please could u answer and help me
thank you

nabila.abdessaied wrote:
i just wanna to have tow thread waiting a notification from another
and when another send the notification
they could go out from waiting and do their jobHi.
Below is an example of how you could do this. It is taken from http://www.javaconcurrencyinpractice.com/listings.html (5.11 Using CountDownLatch for starting and stopping threads in timing tests) .
The idea is simple:
(1) main thread starts nThreads, but all of them, once started, are "suspended" in startGate.await();
(2) when all threads are started, main thread calls startGate.countDown(); and all those waiting threads "are off" at once.
I'm not sure that you need 'endGate' though (but I thought that it is not that good to cut somebody's else example...)
* TestHarness
* <p/>
* Using CountDownLatch for starting and stopping threads in timing tests
* @author Brian Goetz and Tim Peierls
public class TestHarness {
    public long timeTasks(int nThreads, final Runnable task)
            throws InterruptedException {
        final CountDownLatch startGate = new CountDownLatch(1);
        final CountDownLatch endGate = new CountDownLatch(nThreads);
        for (int i = 0; i < nThreads; i++) {
            Thread t = new Thread() {
                public void run() {
                    try {
                        startGate.await();
                        try {
                            task.run();
                        } finally {
                            endGate.countDown();
                    } catch (InterruptedException ignored) {
            t.start();
        long start = System.nanoTime();
        startGate.countDown();
        endGate.await();
        long end = System.nanoTime();
        return end - start;
}Seems this is what you were looking for (if I understood you right).

Threads waiting the same event :searching for a specific notificationfor

hi all,
i have two thread waiting an event
and another who notify them
//the class event
public final class Event {
* variable used to store the notification if it takes place
* before being expected
private boolean status = false;
public final synchronized void waitForNotification() {
while (status == false ) {
try {
wait();
catch (InterruptedException e) {
status = false ;
// notify all waits on this event
public final synchronized void wakeUp() {
status = true;
notifyAll();
// the class TestThread implements a thread that have an event waiting for a notification
public class TestThread extends Thread{
private Event event;
public TestThread( Event e){
event=e;
public void run(){
for (int i = 1; i < 4; i += 1) {
try {
Thread.sleep(2);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
e.waitForNotification();
// the class TestThread2 implements a thread that have an event waiting for a notification
public class TestThread2 extends Thread{
private Event event;
public TestThread( Event e){
event=e;
public void run(){
for (int i = 1; i < 4; i += 1) {
e.wakeUp();
//the class main
public class test {
* @param args
public static void main(String[] args) {
// TODO Auto-generated method stub
Event e = new event();
TestThread th1 = new TestThreadConsumer(e);
TestThread th2 = new TestThread(e);
TestThread2 th= new TestThread2(e);
th1.start();
th2.start();
th3.start();
1st case
the problem is that the notification could not be seen to the tow threads
because if the tow are waiting the notification
and the other thread send notification
one of the tow see the notificztion and wake up and set the flag status to false so the other one could not ever wake up
2d case
the notification of the second thread could be done in the second itiration or in the other ones
please could u answer and help me
thank you

I'm locking this thread since it's a duplicate.
The discussion will continue in: [http://forums.sun.com/thread.jspa?threadID=5377151&tstart=0]
Kaj

Simple MPD notifications

I searched and searched, but could not find a simple MPD notification script that worked for me. So I whipped up my own, and here it is, as simple as you like.
#!/usr/bin/bash
dir="/home/ramo/Music/"
while :
do
output=$(mpc -f "%title%\n%artist%\n%album%\n%file%" current --wait)
if [ $? -eq 1 ]
then
sleep 5
else
i=1
while read -r line; do
array[$i]="$line"
(( i++ ))
done <<< "$output"
file=$(ls -t "$(dirname "$dir${array[4]}")"/*.{jpg,png} 2> /dev/null | head -n 1)
notify-send "${array[1]}" "${array[2]} - ${array[3]}" -t 5000 -i "$file"
fi
done

graysky wrote:There are many out there. For example: https://github.com/vehk/mpdnotify
I'm sure there's heaps.

Wait on notification, occurence. is it sleep?

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